Yeah we need stock control
I personally think stock control should be part of eCart as well. I've been using eCart since version 1 after moving from UltraCart which did have stock control as standard. I'm sorry to say that between version 1 and 4 theres not been many new features added. Sure you get more payment gateways and improved code etc and a few more wizards, but ecommerce has moved on along way since version 1 was released and its time customers were listened to and a more rounded extension was delivered. I think the big feature in version 4 was it was all CSS based, but the standard of the layouts and images was poor compared to the 3.
You do market this as a e-commerce solution. Its time it really was a beginning to end product.